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三角形内角和
Author:
谢鹏
GeoGebra
New Resources
【案例】2018年全国1卷理科12题
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
兩位數除以一位數（二）
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linear function
平面
polygon(first upload)
Spiral Polyskelion
繡曲線
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Congruence
Fractal Geometry
Geometric Transformations